Here is a list of links that I think are useful, informational, or just plan fun. I will add more as I come across them, and I welcome any suggestions for sites you think I should include!
For more information about luxating patella (Callie's condition):
A short site with info about the pomapoo (Callie's breed):
More photos of Callie on Picasa:
Centre DMV Veterinary Center:
Élephant Mauve Blog: